This tickbox tells SolidWorks to stop using the Geforce card and do graphical processing using the CPU. Given this you should certainly expect it to be slower. However if you do not get the issue mentioned above then this proves the issue is with the graphics card/driver.

Maha, I notice that this is a desktop computer. As you are a student, and using a student edition, I would have thought you would be using a laptop/notebook as a much more viable option? How do you use SolidWorks when in class? What courses are you studying? The more complex the course, the more demand there might be on SolidWorks and therefore the more issues you may encounter with not having the correct requirements for SolidWorks.

I follow stand-alone course in SW. There are desktop computers in the class. Before I had laptop as well, now I am not using laptop because its screen size is limited and I not comfortable with its mouse. I am very comfortable with desktop computers.